[hatari-devel] Compilation Problem: Debian 9.6 "apt install libsdl2-dev" fails: FIXED

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Compiling hatari sounds like a good idea. Cmake informed me:

-- Looking for pthread_create in pthread - found
-- Found Threads: TRUE  
-- Could NOT find SDL2 (missing:  SDL2_LIBRARY SDL2_INCLUDE_DIR) 
-- Could NOT find SDL (missing:  SDL_LIBRARY SDL_INCLUDE_DIR) 
CMake Error at CMakeLists.txt:118 (message):
  SDL library not found!

So I checked to see what parts of SDL I do have:

root@hawk:~# pre libsdl
libsdl1.2debian	1.2.15+dfsg1-4		amd64
libsdl2-2.0-0	2.0.5+dfsg1-2		amd64

So I went to install the -dev package, and got:

root@hawk:~# apt install libsdl2-dev
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
 libsdl2-dev : Depends: libegl1-mesa-dev but it is not going to be installed
               Depends: libgl1-mesa-dev but it is not going to be installed
               Depends: libgles2-mesa-dev but it is not going to be installed
               Depends: libglu1-mesa-dev but it is not going to be installed
E: Unable to correct problems, you have held broken packages.

The problem, which apt did not indicate in its error message, is that
both libsdl packages has been installed from backports. The solution,
then, is to install the -dev package from there as well.

apt -t stretch-backports install libsdl2-dev

Just an FYI for future developers.

"When we talk of civilization, we are too apt to limit the meaning of
the word to its mere embellishments, such as arts and sciences; but
the true distinction between it and barbarism is, that the one
presents a state of society under the protection of just and
well-administered law, and the other is left to the chance government
of brute force."
- The Rev. James White, Eighteen Christian Centuries, 1889
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